Rust inhibiting oil composition



Patented Dec. 16, 1947 Sven Christian J ohansson, Gothenburg, Sweden No Drawing. Application July 26, 1944, Serial No. 546,730. In Sweden August 12, 1943 The present invention relates to improvements of oils and greases of mineral or vegetable origin and has for its object to reduce or eliminate the corrosive action thereof on metals and alloys, in

first instance iron and steel. Oils and greases here referred to are to be used as lubricants, as protection against corrosion, and they also include fuel oils such as benzine and liquid fuel mixtures and coating and desiccant oils if used alone or mixed with other substances such as alcohols, dye-stuffs, etc.

The disclosure of this specification relates to corrosion inhibiting oil insoluble nitrophenols and to the manner in which they may be added to oils in the insoluble state. The oil insolubility of relatively low molecular weight nitrophenols has long been known and their addition to oils heretofore has been accomplished by increasing the number of carbon atoms by an alkyl or allphatic addition to the aromatic nucleus. The aliphatic addition to the aromatic nucleus causes the composition to be oil soluble and it is not my intention to claim the use of such relatively high molecular weight nitrophenols which are directly soluble in oil as a, part of my invention.

I have found that an addition of small quantities of neutralized nitrophenols or nitrophenolates to oils or greases will impart to these-products a non-corrosive character. The nitrophenolates used for this purpose may have one or-more nitro groups. If, for instance, a mineral lubricant oil has incorporated therein a small quantity of dinltrophenolsodium, (NO2)2.CeHa.ONa, such a lubricant will prevent formation of rust on ballbearing steel also if a quantity of distilled water or ordinary water from water-conduit has been added to the lubricant oil. In lieu of the sodium salt other alkali salt of dinitrophenol may be used.

the oil or lubricant in respect of its anti-corrosion properties are not soluble in the oil. In such cases the nitrophenolate must be dissolved in a suitable organic solvent prior to its addition to the oil. The compound dinitrophenolsodium mentioned above as an example may, for instance, be dissolved in amylalcohol or amylacetate, and this solution is then added to the oil. The product thus obtained is a transparent, oily, possibly coloured, substantially neutral liquid which appears to be stable in its composition. I have found that such an oil is an excellent anticorrosion lubricant or protection against corrosion for iron and steel.

The proportions of the constituents of the oil At least certain nitrophenolates which improve 8 Claims. (Cl. 252-421) or grease may be varied within rather wide limits. As an example of a'suitable composition the following proportions may be mentioned: At most 1 part by weight of dinitrophenolsodium is dissolved in 100 parts by weight of amylalcohol. About 1 part by weight of this solution is added to 10 parts by weight of the oil. The addition may be eflected at ordinary room temperature.

and only an agitation is required so that the constituents are well mixed with each other.

Besides the alkali compounds of dinitrophenol also salts of other nitrophenols such as salts of mononitrophenoi and of the homologues of monoand dinitrophenols may be used.

As abovementioned, the invention is not restricted to lubricants or oils used as protection against corrosion, but the nitrocompounds above mentioned may also be used for the improvement of other oils with great advantage,

It is a known fact that mixtures of spirit and benzine sometime used as fuel in motors have a corrosive action on metals, particularly iron, of which tanks for such fuels are made, and the corrosive action is increased with increasing percentage of spirit in the mixtures. A small addition oi a nitrophenolate (for instance 0.01 to 0.5%) results in a fuel with non-corrosive character.

Desiccative oils used for coating or painting purposes, such as linseed oil (also mixed with dyestuffs) may be' made non-corrosive by the present invention in order to protect metal tanks in which they are kept or metal surfaces coated with such oils. An incorporation of a small quantity, say between 0.05 and 0.5%, of a nitrophenolate such as alkali salt of dinitrophenol, is sufflcient for this purpose.

What I claim is:

1. A rust inhibiting oil composition comprising an oil, an alkali metal salt of a nitrophenol normally insoluble in the oil and a solvent of the group consisting of amylalcohol and aniylacetate for solubilizing the alkali metal salt, the said alkali metal salt of nitrophenol being present in an amount sufficient to inhibit corrosion by the oil.

2. A rust inhibiting oil composition comprising an 011, an alkali metal salt of a nitrophenol normally insoluble in the oil and the solvent amyialcohol for solubilizing the alkali metal salt. the said alkali metal salt of nitrophenol being present in an amount suflicient to inhibit corrosion by the oil.

3. A rust inhibiting oil composition comprising an oil, an alkali metal salt of a nitrophenol normally insoluble in the oil and the solvent amylacetate tor solubilizing the alkali metal salt. the said alkali metal salt of nitrophenol being present in an amount sufllcient to inhibit corrosion by the oil.

4. A rust inhibiting oil composition comprising an oil, an alkali metal salt of a dinitrophenol normally insoluble in the oil and a solvent of the group consisting of amylalcohol and amylacetate for solubilizing the alkali metal salt, the said alkali metal salt of dinitrophenol being present in an amount suflicient to inhibit corrosion by the oil.

5. A rust inhibiting oil composition comprising an oil, an alkali metal salt of a dinitrophenol normally insoluble in the oil and the solvent amylalcohol for solubilizing the alkali metal salt,

- the said alkali metal salt of nitrophenol being present in an amount sufficient to inhibit corrosion by the oil.

6. A rust inhibiting oil composition comprising 20 an oil, an alkali metal salt of a dinitrophenol normally insoluble in the oil and the solvent amylacetate for solubilizing the alkali metal salt, the said alkali metal salt of nitrophenol being present in an amount sufiicient to inhibit corrosion by the oil.

7. A rust inhibitor composition for addition to oil consisting of a solution of an alkali metal salt 4 of a nitrophenol not normally soluble in oil in an oil soluble organic solvent of the group consisting of amylalcohol and amylacetate for solubilizing the said alkali metal salt of nitrophenol in an oil.

8. A rust inhibitor composition for addition to oil consisting of a solution of an alkali metal salt of a dinitrophenol not normally soluble in oil in an oil soluble organic solvent of the group consisting of amylalcohol and amylacetate for solubilizing the said alkali metal salt of di-nitrophenol in an 011.

SVEN CHRISTIAN JOHANSSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Certificate of Correction Patent No. 2,432,901.

SVEN CHRISTIAN JOHANSSON December 16, 1941.

It is hereby certified that error appears in the Cprinted specification of-the above numbered atent re under Marks correction as follows:

umng ITED S ATES PATENTS add the following:

Calcott Lieber olumn 4, list of references cited,

Dec. 29, 1936' Dec. 10,1940 Mar. 21, 1944 and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 13th day of April, A. D. 1948.

THOMAS F. mar,

Accident Qouum'ulogdf of PM. 

